[gcc r16-200] gccrs: Fix crash in hir dump as labels are optional

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:75a57211f698242d247f5c4230b8348b236f9ded

commit r16-200-g75a57211f698242d247f5c4230b8348b236f9ded
Author: Philip Herron <herron.phi...@googlemail.com>
Date:   Wed Apr 16 17:00:28 2025 +0100

    gccrs: Fix crash in hir dump as labels are optional
    
    gcc/rust/ChangeLog:
    
            * hir/rust-hir-dump.cc (Dump::visit): add guard for optional label
    
    Signed-off-by: Philip Herron <herron.phi...@googlemail.com>

Diff:
---
 gcc/rust/hir/rust-hir-dump.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gcc/rust/hir/rust-hir-dump.cc b/gcc/rust/hir/rust-hir-dump.cc
index dafa8236ba10..16fce6be28e6 100644
--- a/gcc/rust/hir/rust-hir-dump.cc
+++ b/gcc/rust/hir/rust-hir-dump.cc
@@ -1284,7 +1284,9 @@ Dump::visit (BlockExpr &e)
   do_expr (e);
   do_inner_attrs (e);
   put_field ("tail_reachable", std::to_string (e.is_tail_reachable ()));
-  put_field ("label", e.get_label ().as_string ());
+
+  if (e.has_label ())
+    put_field ("label", e.get_label ().as_string ());
 
   visit_collection ("statements", e.get_statements ());